Superheater.



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@ZM my PATENTED JUNE 20, 1905.

W. SCHMIDT.

SUPERHBATER.

APPLICATION FILED Nov. 7. 1904.

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PATENT OFFICE.

SUPERHEATER.

SPECIFICATION forming part of Letters Patent No. 792,853, dated June 20, 1905.

Application filed November 7,1904. Serial No. 231,759.

To all whom. it may concern:

Be it known that I, WILHELM SCHMIDT, a subject of the King of Prussia, German Emperor', and a resident of I/Vilhelmshhe, near Cassel, in the Province of Hesse-Nassau, German Empire, have invented certain new and useful Improvements in Superheaters for Heating Tube-Boilers, ot' which the following-is an exact specification.

My invention relates to superheaters for heating tube-boilers, such as are used for locomotive, locomobile, ship, or similar purposes, and has for its purpose to utilize the combustion-gases in a most perfect manner by placing ring-tubes serving as superheaters into the lllucs of the tube-boilers. These ring-tubes are provided with return-chan nels, leading the steam to be superheated in one direction and then in the other through the tubes. The ring-tubes are so arranged within the lues that the heating-gases How through the interior of the ring-tubes, thereby heating the steam to be superheated. Such superheaters may be arranged in heating tube-boilers of ordinary kind to be put up, or already-iinished tube-boilers may subsequently be fitted out with such superheaters by substituting some of the lines of the boiler by larger Ilues, so as to create within the iiues the space necessary for subsequently putting in the superheating ring-tubes. Such superheatcrs have the advantage that thc tubes can easily be cleaned, especially as the inner diameter can be made comparatively great. Instead of leading the heating-gases only through the interior of the ring-tubes, these latter may be so arranged within the flues that the heating-gases also flow along the outside oi" the superheater-tubes. This latter is a most effective arrangement, as the heating-gases lirst heat the ring-tubes from the inside, secondly from the outside, and thirdly they heat at the same time the iues. Such constructional forms are shown in the accompanying drawings as matters of example, in whichg Figure l shows the general arrangement of a superheater according to my invention within a heating tube-boiler. Fig. 2 shows a front view of the superheater. Fig. 3 shows how to place a superheater ring-tube into a iluc.

Figs. 3 and 3" are cross-sections through the tube according to Fig. 3. Figs. L and 5 show similar views as Fig. 3, but illustrate different means for connecting the ring-tube with its steam-chambers. Fig. 6 shows a ring-tube provided with sector like inside channels. Figs. 6" and 6l are cross-sections through the arrangement according to Fig. 6.

In the drawings, a represents lues mounted in the tube-boiler body c.

7) are two steam-chambers, chamber b being connected by pipe a to thc steam-dome c.

r represents superheater ring-tubes placed into some of the iiues.

The ring-tubes according to Fig. 3 consist of the ring-tube proper, having an outside tube a and an inside tube 7*. Into the annular space between /r and 11' a tube /12 is placed` so as to create two channels, one of which is connected to the steam-chamber I), whereas the other discharges into the chamber 7)'. The working of this arrangement is as, follows: The heating-gases generated in the {ire-box c2 of the boiler enter the iues at the left-hand side, as indicated by arrows. In these Iiues, which are provided with superheater ringtubes, the heating-gases are divided into two separate gas streams, one passing through the interior of the superheater-tubes and the other along outside of these tubes. The gases then leave the flues and tubes and enter into the smoke-box m. The steam to be superheated flows through pipe m into chamber enters the ring-tube through the openings 0, flows within these tubes to the left, then passes through the space q at the left-hand end of the tubes over to the outside channel, and iows through the same back to the right, enters through openings 0 the chamber b, from which the steam, now superheated, is led to its place oi destination.

In the arrangement according to Fig. 3 the ring-tubes are directly put into the steamchambers b and whereas Fig. 4 shows special conical tightening-tubes s between the ring-tube ends and the walls of the steamchambers, thereby facilitating the tightening and exchanging of the ring-tubes. In the arrangement according to Fig. 5 special packing-rings Z Z are arranged, which are pressed IOO . steam-chamber L.

by a stuffing-box against the end of the superheater-tube and the steam-chamber walls, so as to give a perfect tightening.

In the arrangements according to Figs. 3 to I 5 the partition between the annular space of the superheater-tubes for obtaining returnchannels within these tubes is formed by a heat-insulating double tube. In Fig. 6 another device is shown for obtaining returnchannels within the annular space of the superheater-tubes. This space is divided by four longitudinal divisions into four sectorlike channels, two of which, z' 71, are connected at the right end to the steam-chamber whereas the right-hand ends of the sector-like channels c" c" are connected to the steam-chamber b. At the left-hand end both pairs'of steam channels z' z' z" z" arc connected with one another by the end spaces q. rIhe steam vto be superheated again enters from the steamchamber through the openings o, the channels c' 71, flows through these sector-like channels to the left, enters through Q the channels t" c, Hows to the right, and the steam, now superheated by the heating-gases flowing through the interior, as well as along the outside of the superheater-tubes, leaves these latter through the openings 0 and can then be led from the chamber to the place where it is to be used.

In the devices according to Figs. 3 to 5 the steam is [irst heated b v the gases flowing through the interior of the su perheater-tubes and then is further superheated on its way through the outside channel by the heatinggases iowing outside along the tubes, the heat-insulating double tubes frz preventing that the steam flowing' through the inside channel between fr and fr cools the more superheated steam stream flowing through the outside channel between r and fr into the The device according' to Fig. 6 is of more simple construction, as there are no heat-insulating double tubes placed into the superheatcr-tubes, the steam Howing to the left and then back to the right, being on its whole way heated simultaneously by both the heating-gases flowing through the interior of the tubes and those flowing along outside the superheater-tubes.

Fig. l further shows two VH aps j) p, by' means of which thatspace into which the gases flowing along the outside of the superheater-tubes enter can be cut off from the smoke-box fm. If the flaps are closed, the heating-gases will only flow through the interior of the superheater-tubes. Furthermore, flaps can be provided for cutting ofIl the connection between the interior of the superheater-tubesvthat is to say, the interior of the inner tube fr', through which heating-gases are iowing, and the chamber m by means of closing members. rI`hese may be suitably connected to the blastpipe, so that in working the blast-pipe the iaps are closed, whereas they are opened if the blast-pipe is cut off.

Having thus fully described the nature of my invention, what Idesire to secure by Letters Patent of the United States is l. In a heating tube-boiler, the combination of the boiler-body proper, with a set of flues, superheater ring-tubes so placed into a number of the flues as to lead heatinggases through the interior of said tubes, these latter being provided with channels for leading the steam to be superheated forward and backward, substantially as described and for the purpose set forth.

2. In a heating tube-boiler, the combination of the boiler-body proper, with a set of flues, superheater ring-tubes so placed into a number of the flues as to lead heatinggases through the interior of said tubes, whereas at the same time the heating-gases pass along the outside of these ring-tubes, the latter being provided with channels for leading the steam to be superheated forward and backward, substantially as described and for the purpose set forth.Y

3. In a heating tube-boiler, the combination of the boiler-body proper, with a set of flues, superheater ring-tubes so placed into a number of the ues as to lead heating' -gases through the interior of said tubes, whereas at the same time the heating-gases pass along the outside of said ring-tubes, thereby heating the same from outside, the ring-tubes being provided with channels for leading' the steam to be super-heated forward and backwardfthese channels being formed by a heatinsulating tube concentrically placed between the outer and the inner wall of the superheatertube, substantially as described and for the purpose set forth.

4. In a heating tube-boiler, the combination of the boiler-body proper, with a set of lines, superheater ring-tubes so placed into a number of the flues as to lead heating' gases through the interior of said tubes, whereas at the same time heating-gases pass along the outside of said ring-tubes, thereby heating the same, these tubes being provided with channels for leading the steam to be superheated forward and backward.I these channels being formed by a heat-insulating tube concentrically placed between the outer and the inner wall of the superheater-tube, the insu.- lating-tube consisting of two tubes concentrically placed close to each other, substantially as described and for the purpose set forth.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

VILHELM SCHMIDT.

Witnesses:

HENRY HAsreR, WOLDEMAR HAUPT.

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